//如果你在异步函数中返回一个值，这个值会被包装成一个已完成（fulfilled）的 Promise
async function fetchData(){
    return 'zhufeng';
}
/* console.log(fetchData);
let result = fetchData();
result.then(value=>{
    console.log(value);
}) */
(async function(){
   let result =  await fetchData();
   console.log(result);
})();